Evaluating causal associations of chronotype with pregnancy and perinatal outcomes and its interactions with insomnia and sleep duration: a mendelian randomization study by Qian Yang, Maria C. Magnus, Fanny Kilpi, Gillian Santorelli, Ana Goncalves Soares, Jane West, Per Magnus, Siri E. Håberg, Kate Tilling, Deborah A Lawlor, M Carolina Borges, Eleanor Sanderson

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